Compasses.



N0 MODEL.

' PATENTED MAR. 22, 1904.

G. SGHOENNER.

GOMPA'SSES.

APPLICATION FILED NOV. 7, 1903.

HHHHH said,) have invented Patented March 22, 1904.

enone sononunnn, or nnnnnnnne. enncompasses.

SPECIFICATION forming part of Letters Patent No. 755,396, dated Marh 22,11904.

Application filed lllovember 7, 190a. Serial Iil'o.180,257. (No man Toall whom, it may concern.-

Be it known that I, Gnono SoHoENNER, manufacturer, a subject of theEmperonof Germany, and a resident of Nuremberg, in the Empire ofGermany, (whose post-ofice address is 7 Gartenstrasse, Nuremberg afore-.certain new and useful Improvements in Compasses, of which .thefollowing is a'specification.

The present invention relates to compasses provided with inserted isclamped firmly in a smooth guide or; holder and in this manner adjustedto av suitable length and also secured against lateral movements:

The improvement introduced therein has for its object to allow of theline adjustment of the pin by turning a nut, arranged at the side of thecompass-leg and which is therefore easily-handled. This advantage isobtained by the insertion-pin being connected with a spindle guidedparallel to the needle at the side of the compass-leg, which spindlecarries the pin with it. (in the upper threaded part of this spindle anut is mounted and prevented from being displaced longitudinally. A pairof compasses provided with this improved fine adjusting arrangementforthe pin is shown in Figures 1 to 5 of the accompanying drawings.

Tn the drawings, Fig. 1 is an elevation of .the lower portion of oneleg; Fig. 2, a crosssection taken in proximity to set-screw c. Fig. 3 isa view similar to Fig. l, but with the leg a quarter turned- Fig. i. isa cross-section in proximity to the pin ,g, and Fig. 5 is a View of theentire compasses except that the other'leg is broken away.

The lower end of the leg at is divided into two grooved springparts 6 bymeans of a lon-.

gitudinal perforation and a longitudinal slot, the said two parts 6being held together by'a set-screws and gripping between themthe pin Thelatter has a groove 6 either at its upper end alone or, in case it isprovided with two points, as shown in, the accompanying drawings, atboth ends. A spindle fis mounted pins in which the pin on the side ofthe leg 0: parallel to the pin, but

not on the same axis, which spindle carries at its lower end a catch-ping, directed toward the middle of the compasses. This pin projectsthrough the longitudinal slot of the lower leg of the compasses andengages in the groove or grooves e of the pin, so that-when.longitudinally displaced the spindle f carries the pin along with'it,while after the clamp-shrew c is 4 loosened the pin may be suitablyturned. The catch-pin g, sliding in the longitudinal slot of the leg a,also serves for preventing the spindle f rotating. The upper part of thespindleis threaded and passedthrough two guide pieces arranged closelyone above the other. The heads of two screws h, which heads are providedwith cross-perforations, may be employed as such guide-pieces. Betweenthese screws 5. a stud 2', formed as a nut, is arranged, which isadapted to be rotated on the thread of the spindle f and is milled onits periphery or otherwise treated to enable it to be easily held. Anylongitudinal displacement is prevented by the screws h, against whichthe stud '5 directly bears. On turning the stud a longitudinaldisplacement of'the spindle f, which is prevented rotating, takes place.The pin (Z, carried along by the pin 9, shares in this movement, so thata suitable and exact fine adjustment of the pin a? in the direction ofits height is possible. After theadjustment has taken place the pin maybe secured in its then position against any unintentional longitudinaldisplacement and also against lateral movement by screwing tight thesetscrew 0. I

I declare that what I claim is l. in a pair of compasses the combinationwith one of the legs thereof, of a pin slidingly carried thereby, andindependent screw-operated means carried by said leg for slidingsaid pinsubstantially as described.

2. The combination with'one of the legs of .a pairofcompasses, of a pinslidingly carried thereby, a threaded spindle mounted to slidelengthwise of said leg and having an operative connection with the pin,and a nut on said spindle with means for preventing movementof the samelongitudinally of the leg substantially as dBSCIibQd."

3. The combination with one of the legs of a pair of compasses of apinmounted to slide in a guide in said leg, a threaded spindle slidinglysupported at the side of the leg, a pin projecting from said spindle andengaging the pin, a nut on said thread and stops on each side of saidnut for preventing movement of IO the same longitudinally of the legsubstantially as described,

In Witness whereof I have hereunto set my hand in presence of twowitnesses,

' GEORG SCHOENNER. Witnesses:

LEONHARD KOERBER, HERMANN ,DoHLEMANN.

